sys/fs/nfsserver/nfs_nfsdkrpc.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Rick Macklem at The University of Guelph.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  */
  35
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD$");
  38
  39 #include "opt_inet6.h"
  40 #include "opt_kgssapi.h"
  41 #include "opt_kern_tls.h"
  42
  43 #include <fs/nfs/nfsport.h>
  44
  45 #include <rpc/rpc.h>
  46 #include <rpc/rpcsec_gss.h>
  47 #include <rpc/rpcsec_tls.h>
  48
  49 #include <fs/nfsserver/nfs_fha_new.h>
  50
  51 #include <security/mac/mac_framework.h>
  52
  53 NFSDLOCKMUTEX;
  54 NFSV4ROOTLOCKMUTEX;
  55 char *nfsrv_zeropnfsdat = NULL;
  56
  57 /*
  58  * Mapping of old NFS Version 2 RPC numbers to generic numbers.
  59  */
  60 int newnfs_nfsv3_procid[NFS_V3NPROCS] = {
  61         NFSPROC_NULL,
  62         NFSPROC_GETATTR,
  63         NFSPROC_SETATTR,
  64         NFSPROC_NOOP,
  65         NFSPROC_LOOKUP,
  66         NFSPROC_READLINK,
  67         NFSPROC_READ,
  68         NFSPROC_NOOP,
  69         NFSPROC_WRITE,
  70         NFSPROC_CREATE,
  71         NFSPROC_REMOVE,
  72         NFSPROC_RENAME,
  73         NFSPROC_LINK,
  74         NFSPROC_SYMLINK,
  75         NFSPROC_MKDIR,
  76         NFSPROC_RMDIR,
  77         NFSPROC_READDIR,
  78         NFSPROC_FSSTAT,
  79         NFSPROC_NOOP,
  80         NFSPROC_NOOP,
  81         NFSPROC_NOOP,
  82         NFSPROC_NOOP,
  83 };
  84
  85 SYSCTL_DECL(_vfs_nfsd);
  86
  87 NFSD_VNET_DEFINE_STATIC(int, nfs_privport) = 0;
  88 SYSCTL_INT(_vfs_nfsd, OID_AUTO, nfs_privport, CTLFLAG_NFSD_VNET | CTLFLAG_RWTUN,
  89     &NFSD_VNET_NAME(nfs_privport), 0,
  90     "Only allow clients using a privileged port for NFSv2, 3 and 4");
  91
  92 NFSD_VNET_DEFINE_STATIC(int, nfs_minvers) = NFS_VER2;
  93 SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_min_nfsvers,
  94     CTLFLAG_NFSD_VNET | CTLFLAG_RWTUN, &NFSD_VNET_NAME(nfs_minvers), 0,
  95     "The lowest version of NFS handled by the server");
  96
  97 NFSD_VNET_DEFINE_STATIC(int, nfs_maxvers) = NFS_VER4;
  98 SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_max_nfsvers,
  99     CTLFLAG_NFSD_VNET | CTLFLAG_RWTUN, &NFSD_VNET_NAME(nfs_maxvers), 0,
 100     "The highest version of NFS handled by the server");
 101
 102 static int nfs_proc(struct nfsrv_descript *, u_int32_t, SVCXPRT *xprt,
 103     struct nfsrvcache **);
 104
 105 extern u_long sb_max_adj;
 106 extern int newnfs_numnfsd;
 107 extern time_t nfsdev_time;
 108 extern int nfsrv_writerpc[NFS_NPROCS];
 109 extern volatile int nfsrv_devidcnt;
 110 extern struct nfsv4_opflag nfsv4_opflag[NFSV42_NOPS];
 111 extern int nfsd_debuglevel;
 112
 113 NFSD_VNET_DECLARE(struct proc *, nfsd_master_proc);
 114
 115 NFSD_VNET_DEFINE(SVCPOOL *, nfsrvd_pool);
 116 NFSD_VNET_DEFINE(int, nfsrv_numnfsd) = 0;
 117 NFSD_VNET_DEFINE(struct nfsv4lock, nfsd_suspend_lock);
 118
 119 NFSD_VNET_DEFINE_STATIC(bool, nfsrvd_inited) = false;
 120
 121 /*
 122  * NFS server system calls
 123  */
 124
 125 static void
 126 nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
 127 {
 128         struct nfsrv_descript nd;
 129         struct nfsrvcache *rp = NULL;
 130         rpc_gss_rawcred_t *rcredp;
 131         int cacherep, credflavor, i, j;
 132         u_char *p;
 133 #ifdef KERN_TLS
 134         u_int maxlen;
 135 #endif
 136
 137         NFSD_CURVNET_SET_QUIET(NFSD_TD_TO_VNET(curthread));
 138         memset(&nd, 0, sizeof(nd));
 139         if (rqst->rq_vers == NFS_VER2) {
 140                 if (rqst->rq_proc > NFSV2PROC_STATFS ||
 141                     newnfs_nfsv3_procid[rqst->rq_proc] == NFSPROC_NOOP) {
 142                         svcerr_noproc(rqst);
 143                         svc_freereq(rqst);
 144                         goto out;
 145                 }
 146                 nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc];
 147                 nd.nd_flag = ND_NFSV2;
 148         } else if (rqst->rq_vers == NFS_VER3) {
 149                 if (rqst->rq_proc >= NFS_V3NPROCS) {
 150                         svcerr_noproc(rqst);
 151                         svc_freereq(rqst);
 152                         goto out;
 153                 }
 154                 nd.nd_procnum = rqst->rq_proc;
 155                 nd.nd_flag = ND_NFSV3;
 156         } else {
 157                 if (rqst->rq_proc != NFSPROC_NULL &&
 158                     rqst->rq_proc != NFSV4PROC_COMPOUND) {
 159                         svcerr_noproc(rqst);
 160                         svc_freereq(rqst);
 161                         goto out;
 162                 }
 163                 nd.nd_procnum = rqst->rq_proc;
 164                 nd.nd_flag = ND_NFSV4;
 165         }
 166
 167         /*
 168          * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
 169          * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
 170          * mounts.
 171          */
 172         nd.nd_mrep = rqst->rq_args;
 173         rqst->rq_args = NULL;
 174         newnfs_realign(&nd.nd_mrep, M_WAITOK);
 175         nd.nd_md = nd.nd_mrep;
 176         nd.nd_dpos = mtod(nd.nd_md, caddr_t);
 177         nd.nd_nam = svc_getrpccaller(rqst);
 178         nd.nd_nam2 = rqst->rq_addr;
 179         nd.nd_mreq = NULL;
 180         nd.nd_cred = NULL;
 181
 182         if (NFSD_VNET(nfs_privport) != 0) {
 183                 /* Check if source port is privileged */
 184                 u_short port;
 185                 struct sockaddr *nam = nd.nd_nam;
 186                 struct sockaddr_in *sin;
 187
 188                 sin = (struct sockaddr_in *)nam;
 189                 /*
 190                  * INET/INET6 - same code:
 191                  *    sin_port and sin6_port are at same offset
 192                  */
 193                 port = ntohs(sin->sin_port);
 194                 if (port >= IPPORT_RESERVED &&
 195                     nd.nd_procnum != NFSPROC_NULL) {
 196 #ifdef INET6
 197                         char buf[INET6_ADDRSTRLEN];
 198 #else
 199                         char buf[INET_ADDRSTRLEN];
 200 #endif
 201 #ifdef INET6
 202 #if defined(KLD_MODULE)
 203                         /* Do not use ip6_sprintf: the nfs module should work without INET6. */
 204 #define ip6_sprintf(buf, a)                                             \
 205                         (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x",      \
 206                             (a)->s6_addr16[0], (a)->s6_addr16[1],       \
 207                             (a)->s6_addr16[2], (a)->s6_addr16[3],       \
 208                             (a)->s6_addr16[4], (a)->s6_addr16[5],       \
 209                             (a)->s6_addr16[6], (a)->s6_addr16[7]),      \
 210                             (buf))
 211 #endif
 212 #endif
 213                         printf("NFS request from unprivileged port (%s:%d)\n",
 214 #ifdef INET6
 215                             sin->sin_family == AF_INET6 ?
 216                             ip6_sprintf(buf, &satosin6(sin)->sin6_addr) :
 217 #if defined(KLD_MODULE)
 218 #undef ip6_sprintf
 219 #endif
 220 #endif
 221                             inet_ntoa_r(sin->sin_addr, buf), port);
 222                         svcerr_weakauth(rqst);
 223                         svc_freereq(rqst);
 224                         m_freem(nd.nd_mrep);
 225                         goto out;
 226                 }
 227         }
 228
 229         if (nd.nd_procnum != NFSPROC_NULL) {
 230                 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
 231                         svcerr_weakauth(rqst);
 232                         svc_freereq(rqst);
 233                         m_freem(nd.nd_mrep);
 234                         goto out;
 235                 }
 236
 237                 /* Set the flag based on credflavor */
 238                 if (credflavor == RPCSEC_GSS_KRB5) {
 239                         nd.nd_flag |= ND_GSS;
 240                 } else if (credflavor == RPCSEC_GSS_KRB5I) {
 241                         nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY);
 242                 } else if (credflavor == RPCSEC_GSS_KRB5P) {
 243                         nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY);
 244                 } else if (credflavor != AUTH_SYS) {
 245                         svcerr_weakauth(rqst);
 246                         svc_freereq(rqst);
 247                         m_freem(nd.nd_mrep);
 248                         goto out;
 249                 }
 250
 251                 /* Acquire the principal name for the RPCSEC_GSS cases. */
 252                 if ((nd.nd_flag & (ND_NFSV4 | ND_GSS)) == (ND_NFSV4 | ND_GSS)) {
 253                         rcredp = NULL;
 254                         rpc_gss_getcred_call(rqst, &rcredp, NULL, NULL);
 255                         /*
 256                          * The exported principal name consists of:
 257                          * - TOK_ID bytes with value of 4 and 1.
 258                          * - 2 byte mech length
 259                          * - mech
 260                          * - 4 byte principal name length
 261                          * - principal name
 262                          * A call to gss_import_name() would be an
 263                          * upcall to the gssd, so parse it here.
 264                          * See lib/libgssapi/gss_import_name.c for the
 265                          * above format.
 266                          */
 267                         if (rcredp != NULL &&
 268                             rcredp->client_principal->len > 4 &&
 269                             rcredp->client_principal->name[0] == 4 &&
 270                             rcredp->client_principal->name[1] == 1) {
 271                                 /* Skip over the mech. */
 272                                 p = &rcredp->client_principal->name[2];
 273                                 i = (p[0] << 8) | p[1];
 274                                 p += i + 2;
 275                                 i += 4;
 276                                 /*
 277                                  * Set "j" to a bogus length so that the
 278                                  * "i + j" check will fail unless the below
 279                                  * code sets "j" correctly.
 280                                  */
 281                                 j = rcredp->client_principal->len;
 282                                 if (rcredp->client_principal->len > i + 4) {
 283                                         j = (p[0] << 24) | (p[1] << 16) |
 284                                             (p[2] << 8) | p[3];
 285                                         i += 4;
 286                                         p += 4;
 287                                 }
 288                                 if (i + j == rcredp->client_principal->len) {
 289                                         nd.nd_principal = malloc(j + 1, M_TEMP,
 290                                             M_WAITOK);
 291                                         nd.nd_princlen = j;
 292                                         memcpy(nd.nd_principal, p, j);
 293                                         nd.nd_principal[j] = '\0';
 294                                         NFSD_DEBUG(1, "nfssvc_program: "
 295                                             "principal=%s\n", nd.nd_principal);
 296                                 }
 297                         }
 298                         if (nd.nd_princlen == 0)
 299                                 printf("nfssvc_program: cannot get RPCSEC_GSS "
 300                                     "principal name\n");
 301                 }
 302
 303                 if ((xprt->xp_tls & RPCTLS_FLAGS_HANDSHAKE) != 0) {
 304                         nd.nd_flag |= ND_TLS;
 305                         if ((xprt->xp_tls & RPCTLS_FLAGS_VERIFIED) != 0)
 306                                 nd.nd_flag |= ND_TLSCERT;
 307                         if ((xprt->xp_tls & RPCTLS_FLAGS_CERTUSER) != 0)
 308                                 nd.nd_flag |= ND_TLSCERTUSER;
 309                 }
 310                 nd.nd_maxextsiz = 16384;
 311 #ifdef MAC
 312                 mac_cred_associate_nfsd(nd.nd_cred);
 313 #endif
 314                 /*
 315                  * Get a refcnt (shared lock) on nfsd_suspend_lock.
 316                  * NFSSVC_SUSPENDNFSD will take an exclusive lock on
 317                  * nfsd_suspend_lock to suspend these threads.
 318                  * The call to nfsv4_lock() that precedes nfsv4_getref()
 319                  * ensures that the acquisition of the exclusive lock
 320                  * takes priority over acquisition of the shared lock by
 321                  * waiting for any exclusive lock request to complete.
 322                  * This must be done here, before the check of
 323                  * nfsv4root exports by nfsvno_v4rootexport().
 324                  */
 325                 NFSLOCKV4ROOTMUTEX();
 326                 nfsv4_lock(&NFSD_VNET(nfsd_suspend_lock), 0, NULL,
 327                     NFSV4ROOTLOCKMUTEXPTR, NULL);
 328                 nfsv4_getref(&NFSD_VNET(nfsd_suspend_lock), NULL,
 329                     NFSV4ROOTLOCKMUTEXPTR, NULL);
 330                 NFSUNLOCKV4ROOTMUTEX();
 331
 332                 if ((nd.nd_flag & ND_NFSV4) != 0) {
 333                         nd.nd_repstat = nfsvno_v4rootexport(&nd);
 334                         if (nd.nd_repstat != 0) {
 335                                 NFSLOCKV4ROOTMUTEX();
 336                                 nfsv4_relref(&NFSD_VNET(nfsd_suspend_lock));
 337                                 NFSUNLOCKV4ROOTMUTEX();
 338                                 svcerr_weakauth(rqst);
 339                                 svc_freereq(rqst);
 340                                 m_freem(nd.nd_mrep);
 341                                 goto out;
 342                         }
 343                 }
 344
 345 #ifdef KERN_TLS
 346                 if ((xprt->xp_tls & RPCTLS_FLAGS_HANDSHAKE) != 0 &&
 347                     rpctls_getinfo(&maxlen, false, false))
 348                         nd.nd_maxextsiz = maxlen;
 349 #endif
 350                 cacherep = nfs_proc(&nd, rqst->rq_xid, xprt, &rp);
 351                 NFSLOCKV4ROOTMUTEX();
 352                 nfsv4_relref(&NFSD_VNET(nfsd_suspend_lock));
 353                 NFSUNLOCKV4ROOTMUTEX();
 354         } else {
 355                 NFSMGET(nd.nd_mreq);
 356                 nd.nd_mreq->m_len = 0;
 357                 cacherep = RC_REPLY;
 358         }
 359         if (nd.nd_mrep != NULL)
 360                 m_freem(nd.nd_mrep);
 361
 362         if (nd.nd_cred != NULL)
 363                 crfree(nd.nd_cred);
 364
 365         if (cacherep == RC_DROPIT) {
 366                 if (nd.nd_mreq != NULL)
 367                         m_freem(nd.nd_mreq);
 368                 svc_freereq(rqst);
 369                 goto out;
 370         }
 371
 372         if (nd.nd_mreq == NULL) {
 373                 svcerr_decode(rqst);
 374                 svc_freereq(rqst);
 375                 goto out;
 376         }
 377
 378         if (nd.nd_repstat & NFSERR_AUTHERR) {
 379                 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
 380                 if (nd.nd_mreq != NULL)
 381                         m_freem(nd.nd_mreq);
 382         } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
 383                 svcerr_systemerr(rqst);
 384         }
 385         if (rp != NULL) {
 386                 nfsrvd_sentcache(rp, (rqst->rq_reply_seq != 0 ||
 387                     SVC_ACK(xprt, NULL)), rqst->rq_reply_seq);
 388         }
 389         svc_freereq(rqst);
 390
 391 out:
 392         free(nd.nd_principal, M_TEMP);
 393         NFSD_CURVNET_RESTORE();
 394         ast_kclear(curthread);
 395         NFSEXITCODE(0);
 396 }
 397
 398 /*
 399  * Check the cache and, optionally, do the RPC.
 400  * Return the appropriate cache response.
 401  */
 402 static int
 403 nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, SVCXPRT *xprt,
 404     struct nfsrvcache **rpp)
 405 {
 406         int cacherep = RC_DOIT, isdgram, taglen = -1;
 407         struct mbuf *m;
 408         u_char tag[NFSV4_SMALLSTR + 1], *tagstr = NULL;
 409         u_int32_t minorvers = 0;
 410         uint32_t ack;
 411
 412         *rpp = NULL;
 413         if (nd->nd_nam2 == NULL) {
 414                 nd->nd_flag |= ND_STREAMSOCK;
 415                 isdgram = 0;
 416         } else {
 417                 isdgram = 1;
 418         }
 419
 420         /*
 421          * Two cases:
 422          * 1 - For NFSv2 over UDP, if we are near our malloc/mget
 423          *     limit, just drop the request. There is no
 424          *     NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the
 425          *     client will timeout/retry over UDP in a little while.
 426          * 2 - nd_repstat == 0 && nd_mreq == NULL, which
 427          *     means a normal nfs rpc, so check the cache
 428          */
 429         if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL &&
 430             nfsrv_mallocmget_limit()) {
 431                 cacherep = RC_DROPIT;
 432         } else {
 433                 /*
 434                  * For NFSv3, play it safe and assume that the client is
 435                  * doing retries on the same TCP connection.
 436                  */
 437                 if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) ==
 438                     ND_STREAMSOCK)
 439                         nd->nd_flag |= ND_SAMETCPCONN;
 440                 nd->nd_retxid = xid;
 441                 nd->nd_tcpconntime = NFSD_MONOSEC;
 442                 nd->nd_sockref = xprt->xp_sockref;
 443                 if ((nd->nd_flag & ND_NFSV4) != 0)
 444                         nfsd_getminorvers(nd, tag, &tagstr, &taglen,
 445                             &minorvers);
 446                 if ((nd->nd_flag & ND_NFSV41) != 0)
 447                         /* NFSv4.1 caches replies in the session slots. */
 448                         cacherep = RC_DOIT;
 449                 else {
 450                         cacherep = nfsrvd_getcache(nd);
 451                         ack = 0;
 452                         SVC_ACK(xprt, &ack);
 453                         nfsrc_trimcache(xprt->xp_sockref, ack, 0);
 454                 }
 455         }
 456
 457         /*
 458          * Handle the request. There are three cases.
 459          * RC_DOIT - do the RPC
 460          * RC_REPLY - return the reply already created
 461          * RC_DROPIT - just throw the request away
 462          */
 463         if (cacherep == RC_DOIT) {
 464                 if ((nd->nd_flag & ND_NFSV41) != 0)
 465                         nd->nd_xprt = xprt;
 466                 nfsrvd_dorpc(nd, isdgram, tagstr, taglen, minorvers);
 467                 if ((nd->nd_flag & ND_NFSV41) != 0) {
 468                         if (nd->nd_repstat != NFSERR_REPLYFROMCACHE &&
 469                             (nd->nd_flag & ND_SAVEREPLY) != 0) {
 470                                 /* Cache a copy of the reply. */
 471                                 m = m_copym(nd->nd_mreq, 0, M_COPYALL,
 472                                     M_WAITOK);
 473                         } else
 474                                 m = NULL;
 475                         if ((nd->nd_flag & ND_HASSEQUENCE) != 0)
 476                                 nfsrv_cache_session(nd, &m);
 477                         if (nd->nd_repstat == NFSERR_REPLYFROMCACHE) {
 478                                 nd->nd_repstat = 0;
 479                                 if (m != NULL) {
 480                                         m_freem(nd->nd_mreq);
 481                                         nd->nd_mreq = m;
 482                                 }
 483                         }
 484                         cacherep = RC_REPLY;
 485                 } else {
 486                         if (nd->nd_repstat == NFSERR_DONTREPLY)
 487                                 cacherep = RC_DROPIT;
 488                         else
 489                                 cacherep = RC_REPLY;
 490                         *rpp = nfsrvd_updatecache(nd);
 491                 }
 492         }
 493         if (tagstr != NULL && taglen > NFSV4_SMALLSTR)
 494                 free(tagstr, M_TEMP);
 495
 496         NFSEXITCODE2(0, nd);
 497         return (cacherep);
 498 }
 499
 500 static void
 501 nfssvc_loss(SVCXPRT *xprt)
 502 {
 503         uint32_t ack;
 504
 505         ack = 0;
 506         SVC_ACK(xprt, &ack);
 507         NFSD_CURVNET_SET(NFSD_TD_TO_VNET(curthread));
 508         nfsrc_trimcache(xprt->xp_sockref, ack, 1);
 509         NFSD_CURVNET_RESTORE();
 510 }
 511
 512 /*
 513  * Adds a socket to the list for servicing by nfsds.
 514  */
 515 int
 516 nfsrvd_addsock(struct file *fp)
 517 {
 518         int siz;
 519         struct socket *so;
 520         int error = 0;
 521         SVCXPRT *xprt;
 522         static u_int64_t sockref = 0;
 523
 524         so = fp->f_data;
 525
 526         siz = sb_max_adj;
 527         error = soreserve(so, siz, siz);
 528         if (error)
 529                 goto out;
 530
 531         /*
 532          * Steal the socket from userland so that it doesn't close
 533          * unexpectedly.
 534          */
 535         if (so->so_type == SOCK_DGRAM)
 536                 xprt = svc_dg_create(NFSD_VNET(nfsrvd_pool), so, 0, 0);
 537         else
 538                 xprt = svc_vc_create(NFSD_VNET(nfsrvd_pool), so, 0, 0);
 539         if (xprt) {
 540                 fp->f_ops = &badfileops;
 541                 fp->f_data = NULL;
 542                 xprt->xp_sockref = ++sockref;
 543                 if (NFSD_VNET(nfs_minvers) == NFS_VER2)
 544                         svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program,
 545                             NULL);
 546                 if (NFSD_VNET(nfs_minvers) <= NFS_VER3 &&
 547                     NFSD_VNET(nfs_maxvers) >= NFS_VER3)
 548                         svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program,
 549                             NULL);
 550                 if (NFSD_VNET(nfs_maxvers) >= NFS_VER4)
 551                         svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program,
 552                             NULL);
 553                 if (so->so_type == SOCK_STREAM)
 554                         svc_loss_reg(xprt, nfssvc_loss);
 555                 SVC_RELEASE(xprt);
 556         } else
 557                 error = EPERM;
 558
 559 out:
 560         NFSEXITCODE(error);
 561         return (error);
 562 }
 563
 564 /*
 565  * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
 566  * until it is killed by a signal.
 567  */
 568 int
 569 nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
 570 {
 571         char principal[MAXHOSTNAMELEN + 5];
 572         struct proc *p;
 573         int error = 0;
 574         bool_t ret2, ret3, ret4;
 575
 576         error = copyinstr(args->principal, principal, sizeof (principal),
 577             NULL);
 578         if (error)
 579                 goto out;
 580
 581         /*
 582          * Only the first nfsd actually does any work. The RPC code
 583          * adds threads to it as needed. Any extra processes offered
 584          * by nfsd just exit. If nfsd is new enough, it will call us
 585          * once with a structure that specifies how many threads to
 586          * use.
 587          */
 588         NFSD_LOCK();
 589         if (NFSD_VNET(nfsrv_numnfsd) == 0) {
 590                 nfsdev_time = time_second;
 591                 p = td->td_proc;
 592                 PROC_LOCK(p);
 593                 p->p_flag2 |= P2_AST_SU;
 594                 PROC_UNLOCK(p);
 595                 newnfs_numnfsd++;       /* Total num for all vnets. */
 596                 NFSD_VNET(nfsrv_numnfsd)++;     /* Num for this vnet. */
 597
 598                 NFSD_UNLOCK();
 599                 error = nfsrv_createdevids(args, td);
 600                 if (error == 0) {
 601                         /* An empty string implies AUTH_SYS only. */
 602                         if (principal[0] != '\0') {
 603                                 ret2 = rpc_gss_set_svc_name_call(principal,
 604                                     "kerberosv5", GSS_C_INDEFINITE, NFS_PROG,
 605                                     NFS_VER2);
 606                                 ret3 = rpc_gss_set_svc_name_call(principal,
 607                                     "kerberosv5", GSS_C_INDEFINITE, NFS_PROG,
 608                                     NFS_VER3);
 609                                 ret4 = rpc_gss_set_svc_name_call(principal,
 610                                     "kerberosv5", GSS_C_INDEFINITE, NFS_PROG,
 611                                     NFS_VER4);
 612
 613                                 if (!ret2 || !ret3 || !ret4)
 614                                         printf("nfsd: can't register svc "
 615                                             "name %s jid:%d\n", principal,
 616                                             td->td_ucred->cr_prison->pr_id);
 617                         }
 618
 619                         NFSD_VNET(nfsrvd_pool)->sp_minthreads =
 620                             args->minthreads;
 621                         NFSD_VNET(nfsrvd_pool)->sp_maxthreads =
 622                             args->maxthreads;
 623
 624                         /*
 625                          * If this is a pNFS service, make Getattr do a
 626                          * vn_start_write(), so it can do a vn_set_extattr().
 627                          */
 628                         if (nfsrv_devidcnt > 0) {
 629                                 nfsrv_writerpc[NFSPROC_GETATTR] = 1;
 630                                 nfsv4_opflag[NFSV4OP_GETATTR].modifyfs = 1;
 631                         }
 632
 633                         svc_run(NFSD_VNET(nfsrvd_pool));
 634
 635                         /* Reset Getattr to not do a vn_start_write(). */
 636                         nfsrv_writerpc[NFSPROC_GETATTR] = 0;
 637                         nfsv4_opflag[NFSV4OP_GETATTR].modifyfs = 0;
 638
 639                         if (principal[0] != '\0') {
 640                                 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2);
 641                                 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3);
 642                                 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER4);
 643                         }
 644                 }
 645                 NFSD_LOCK();
 646                 newnfs_numnfsd--;
 647                 NFSD_VNET(nfsrv_numnfsd)--;
 648                 nfsrvd_init(1);
 649                 PROC_LOCK(p);
 650                 p->p_flag2 &= ~P2_AST_SU;
 651                 PROC_UNLOCK(p);
 652         }
 653         NFSD_UNLOCK();
 654
 655 out:
 656         NFSEXITCODE(error);
 657         return (error);
 658 }
 659
 660 /*
 661  * Initialize the data structures for the server.
 662  * Handshake with any new nfsds starting up to avoid any chance of
 663  * corruption.
 664  */
 665 void
 666 nfsrvd_init(int terminating)
 667 {
 668
 669         NFSD_LOCK_ASSERT();
 670
 671         if (terminating) {
 672                 NFSD_VNET(nfsd_master_proc) = NULL;
 673                 NFSD_UNLOCK();
 674                 nfsrv_freealllayoutsanddevids();
 675                 nfsrv_freeallbackchannel_xprts();
 676                 svcpool_close(NFSD_VNET(nfsrvd_pool));
 677                 free(nfsrv_zeropnfsdat, M_TEMP);
 678                 nfsrv_zeropnfsdat = NULL;
 679                 NFSD_LOCK();
 680         } else {
 681                 /* Initialize per-vnet globals once per vnet. */
 682                 if (NFSD_VNET(nfsrvd_inited))
 683                         return;
 684                 NFSD_VNET(nfsrvd_inited) = true;
 685                 NFSD_UNLOCK();
 686                 NFSD_VNET(nfsrvd_pool) = svcpool_create("nfsd",
 687                     SYSCTL_STATIC_CHILDREN(_vfs_nfsd));
 688                 NFSD_VNET(nfsrvd_pool)->sp_rcache = NULL;
 689                 NFSD_VNET(nfsrvd_pool)->sp_assign = fhanew_assign;
 690                 NFSD_VNET(nfsrvd_pool)->sp_done = fhanew_nd_complete;
 691                 NFSD_LOCK();
 692         }
 693 }